" I didn't mean I'd seen everything, John Grady said.
I know you didn't.
I just meant I'd seen some things I'd as soon not of.
I know it. There's hard lessons in this world.
What's the hardest?
I dont know. Maybe it's just that when things are gone they're gone. They aint comin back.
Yessir. "

― Cormac McCarthy , Cities of the Plain (The Border Trilogy, #3)